Teacher Development Program Bringing schools and ... · Teacher Development Program Bringing...

Year 12 – Civil Structures - 2016

Teacher Development Program

Bringing schools and Engineering together

Michael van Koeverden


Bringing schools and engineering together

• EA to be your link with the Engineering Profession / Industry

• These forums to provide important networking opportunities with other

teaching professionals

• We want to assist in providing exciting ways of presenting concepts with real

world examples and applications.

• We encourage a link of support with exam assessors

• We would like to make clear the pathways to engineering that exist for all

students- Professional, Trades, VET

• WE AIM TO BE A FACILITATOR IN SUPPORTING YOU



• Drop box

• Creation of the “ENGINEERING STUDIES RESOURCE CENTRE” on Dropbox.

• Teachers and Engineers Australia to share and communicate useful resources.



• Engineering Materials - Civil Structure (Pavement)

Eng. Syllabus Areas:

• H1.2- Diff b/w mat

props & selection,

• H2.1- Determine mat

props and uses

• H4.1- Tech changes in

Eng.



Concrete Slipformed Pavement



Cast-insitu: Slipformed pavement

concrete

(RMS R82- Subbase Concrete,

RMS R83- Plain Base Concrete)

- Place concrete onto concrete

- Design life long but $ cost high

- Construction quality &

workmanship critical - one

chance only to get right !



Concrete Property:

Plastic property

•Slump lower for slip formability

•Low bleed water content in mix

Hardened property

•Compressive strength

•Drying Shrinkage

•Durability



Material Interactions-

•Subgrade- Soil/ clay, gravel, hard-rock etc.

•Subbase- concrete/reinforcing steel

•Base- concrete / reinforcing steel/ fibres

Concrete Structural Properties

•Compressive Strength at 28days

•Cover to reinforcing steel- corrosion

•Construction quality- variable

experience needed

•Repair vs performance- cost $



Corrosion



Steel Corrosion in Concrete

• Passivation of steel reinforcement by

high pH of concrete ~ pH=13

• pH >10.5 steel wont rust if steel

completed covered.

• Initiation of corrosion once chloride

limits at the steel reach a high enough

limit

• Propagation is the time taken for

corrosion to extend throughout the

steel



Problems with materials?



Sprayed bituminous Sealing

Aggregate Surface Asphalt



Sprayed bituminous Sealing Aggregate Surface

- Cheapest road surfacing but shortest design life

~ 3 – 7 years

Asphalt -

more expensive -design life ~7 – 15 years

Concrete Pavement

- Dearest with design life ~ 40 – 100years



Testing and

understanding of

stone property - Basic

Understand limits in

tensile capacity of

materials so design uses

high comp. strength of

mat.

History / Technological change:



• Most National, State and

Territory Governments and

regulators require construction

material products be tested and

reported by a NATA accredited

laboratory to a set standard(s)

What is NATA ?

NATA



NATA

• 1945 NATA was formed at a

conference of all State and

Federal governments.

• The new NATA body was to

provide a national testing service

to Australia and would span all

technical, industry, chemical,

medical and geographical areas

A world’s

first !



NATA

• 3000 NATA facilities

• 50 other countries use NATA’s expertise

• 175 NATA Employees

• 3000 Volunteer NATA Technical experts



Test Standards • Contractor Standards

ASTM- USA EN/CEN-Europe ISO- International



Testing/understanding- conventional steel reinforcing only span so far.

Pre-tensioning/Post-tensioning- can significantly increase spans

C

C

C C

T

T



Pre-tensioned Concrete

• Cables tensioned

• Concrete cast onto cables and sticks.

• At transfer cables cut and concrete placed in

compression



Post-tensioned Concrete

• Cables in ducts not tensioned

• Concrete cast onto ducts

• Cables stressed and compression provided by barrel /wedge

• Ducts grouted to protect cables long-term

• Concrete placed in compression some time after casting.



Material property:



Communications (DS/MVK)

• All communications must be: Clear, Factual & Concise

• Verbal/oral – clear instructions (recorded somewhere)

• Written – reports- do not embellish or make claims.

• Implied- professional service – duty of care to public.

• As professional you can be sued for any of above.

• PI insurance premiums are based on above depending on

the insurers view of your perceived risk to others.



Communications (DS/MVK)

• Expert Witness work- will be cross-examined in court to explain

your opinion expressed by you.

• Need to confirm on what your opinion was based

• Must act on most recent knowledge at time of your report writing.

• But still have a duty of care to public.



• Discussion

Engineers Australia is the trusted voice of the profession. We are the global home for engineering professionals renowned as leaders in shaping a sustainable world. engineersaustralia.org.au

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